8 Plot and Renderer Parameters

6.2

8 Plot and Renderer Parameters

package: plot-gui-lib

8.1 Compatibility

parameter
(plot-deprecation-warnings?) → boolean?
(plot-deprecation-warnings? warnings) → void?
warnings : boolean?
= #f

When #t, prints a deprecation warning to current-error-port on the first use of mix, line, contour, shade, surface, or a keyword argument of plot or plot3d that exists solely for backward compatibility.

8.2 Output

parameter
(plot-new-window?) → boolean?
(plot-new-window? new-window?) → void?
new-window? : boolean?
= #f

When #t, plot and plot3d open a new window for each plot instead of returning an image-snip%.

Users of command-line Racket, which cannot display image snips, should enter

(plot-new-window? #t)

before using plot or plot3d.

parameter
(plot-width) → exact-positive-integer?
(plot-width width) → void?
width : exact-positive-integer?
= 400
parameter
(plot-height) → exact-positive-integer?
(plot-height height) → void?
height : exact-positive-integer?
= 400

The width and height of a plot, in logical drawing units (e.g. pixels for bitmap plots). Used for default arguments of plotting procedures such as plot and plot3d.

parameter
(plot-jpeg-quality) → (integer-in 0 100)
(plot-jpeg-quality quality) → void?
quality : (integer-in 0 100)
= 100

The quality of JPEG images written by plot-file and plot3d-file. See save-file.

parameter
(plot-ps/pdf-interactive?) → boolean?
(plot-ps/pdf-interactive? interactive?) → void?
interactive? : boolean?
= #f

If #t, plot-file and plot3d-file open a dialog when writing PostScript or PDF files. See post-script-dc% and pdf-dc%.

8.3 General Appearance

parameter
(plot-title) → (or/c string? #f)
(plot-title title) → void?
  title : (or/c string? #f)
= #f
parameter
(plot-x-label) → (or/c string? #f)
(plot-x-label label) → void?
  label : (or/c string? #f)
= "x axis"
parameter
(plot-y-label) → (or/c string? #f)
(plot-y-label label) → void?
  label : (or/c string? #f)
= "y axis"
parameter
(plot-z-label) → (or/c string? #f)
(plot-z-label label) → void?
  label : (or/c string? #f)
= #f

Title and near axis labels. A #f value means the label is not drawn and takes no space. A "" value effectively means the label is not drawn, but it takes space. Used as default keyword arguments of plotting procedures such as plot and plot3d.

parameter
(plot-x-far-label) → (or/c string? #f)
(plot-x-far-label label) → void?
  label : (or/c string? #f)
= #f
parameter
(plot-y-far-label) → (or/c string? #f)
(plot-y-far-label label) → void?
  label : (or/c string? #f)
= #f
parameter
(plot-z-far-label) → (or/c string? #f)
(plot-z-far-label label) → void?
  label : (or/c string? #f)
= #f

Far axis labels. A #f value means the label is not drawn and takes no space. A "" value effectively means the label is not drawn, but it takes space. See plot-x-ticks for a discussion of near and far axes.

parameter
(plot3d-samples) → (and/c exact-integer? (>=/c 2))
(plot3d-samples n) → void?
n : (and/c exact-integer? (>=/c 2))
= 41

Number of samples taken of functions plotted by 3D renderers, per-axis. Used as the default #:samples argument of surface3d, polar3d, isoline3d, contours3d, contour-intervals3d, isosurface3d and isosurfaces3d.

parameter
(plot3d-angle) → real?
(plot3d-angle angle) → void?
angle : real?
= 30
parameter
(plot3d-altitude) → real?
(plot3d-altitude altitude) → void?
altitude : real?
= 60

The angle and altitude of the camera in rendering 3D plots, in degrees. Used as default keyword arguments of plotting procedures such as plot3d.

parameter
(plot3d-ambient-light) → (real-in 0 1)
(plot3d-ambient-light amt) → void?
  amt : (real-in 0 1)
= 2/3
parameter
(plot3d-diffuse-light?) → boolean?
(plot3d-diffuse-light? diffuse?) → void?
  diffuse? : boolean?
= #t
parameter
(plot3d-specular-light?) → boolean?
(plot3d-specular-light? specular?) → void?
  specular? : boolean?
= #t

Amount of ambient light, and whether 3D plots are rendered with diffuse and specular reflectance.

parameter
(plot-foreground) → plot-color/c
(plot-foreground color) → void?
color : plot-color/c
= 0
parameter
(plot-background) → plot-color/c
(plot-background color) → void?
color : plot-color/c
= 0

The plot foreground and background color. That both are 0 by default is not a mistake: for foreground colors, 0 is interpreted as black; for background colors, 0 is interpreted as white. See ->pen-color and ->brush-color for details on how Plot interprets integer colors.

parameter
(plot-foreground-alpha) → (real-in 0 1)
(plot-foreground-alpha alpha) → void?
alpha : (real-in 0 1)
= 1
parameter
(plot-background-alpha) → (real-in 0 1)
(plot-background-alpha alpha) → void?
alpha : (real-in 0 1)
= 1

The opacity of the background and foreground colors.

parameter
(plot-font-size) → (>=/c 0)
(plot-font-size size) → void?
  size : (>=/c 0)
= 11
parameter
(plot-font-face) → (or/c string? #f)
(plot-font-face face) → void?
  face : (or/c string? #f)
= #f
parameter
(plot-font-family) → font-family/c
(plot-font-family family) → void?
  family : font-family/c
= 'roman

The font size (in drawing units), face, and family of the title, axis labels, tick labels, and other labels.

parameter
(plot-legend-anchor) → anchor/c
(plot-legend-anchor anchor) → void?
anchor : anchor/c
= 'top-left
parameter
(plot-legend-box-alpha) → (real-in 0 1)
(plot-legend-box-alpha alpha) → void?
alpha : (real-in 0 1)
= 2/3

The placement of the legend and the opacity of its background.

parameter
(plot-tick-size) → (>=/c 0)
(plot-tick-size size) → void?
size : (>=/c 0)
= 10

The length of tick lines, in drawing units.

parameter
(plot-x-tick-label-anchor) → anchor/c
(plot-x-tick-label-anchor anchor) → void?
  anchor : anchor/c
= 'top
parameter
(plot-y-tick-label-anchor) → anchor/c
(plot-y-tick-label-anchor anchor) → void?
  anchor : anchor/c
= 'right
parameter
(plot-x-far-tick-label-anchor) → anchor/c
(plot-x-far-tick-label-anchor anchor) → void?
  anchor : anchor/c
= 'bottom
parameter
(plot-y-far-tick-label-anchor) → anchor/c
(plot-y-far-tick-label-anchor anchor) → void?
  anchor : anchor/c
= 'left
parameter
(plot-x-tick-label-angle) → real?
(plot-x-tick-label-angle angle) → void?
  angle : real?
= 0
parameter
(plot-y-tick-label-angle) → real?
(plot-y-tick-label-angle angle) → void?
  angle : real?
= 0
parameter
(plot-x-far-tick-label-angle) → real?
(plot-x-far-tick-label-angle angle) → void?
  angle : real?
= 0
parameter
(plot-y-far-tick-label-angle) → real?
(plot-y-far-tick-label-angle angle) → void?
  angle : real?
= 0

Anchor and angles for axis tick labels (2D only). Angles are in degrees. The anchor refers to the part of the label attached to the end of the tick line.

Set these when labels would otherwise overlap; for example, in histograms with long category names.

> (parameterize ([plot-x-tick-label-anchor  'top-right]
                 [plot-x-tick-label-angle   30])
    (plot (discrete-histogram '(#(really-long-category-name-1 2)
                                #(long-category-name-2 1.75)
                                #(long-category-name-3 2.5)))))

parameter
(plot-x-axis?) → boolean?
(plot-x-axis? draw?) → void?
  draw? : boolean?
= #t
parameter
(plot-y-axis?) → boolean?
(plot-y-axis? draw?) → void?
  draw? : boolean?
= #t
parameter
(plot-z-axis?) → boolean?
(plot-z-axis? draw?) → void?
  draw? : boolean?
= #t
parameter
(plot-x-far-axis?) → boolean?
(plot-x-far-axis? draw?) → void?
  draw? : boolean?
= #t
parameter
(plot-y-far-axis?) → boolean?
(plot-y-far-axis? draw?) → void?
  draw? : boolean?
= #t
parameter
(plot-z-far-axis?) → boolean?
(plot-z-far-axis? draw?) → void?
  draw? : boolean?
= #t

When any of these is #f, the corresponding axis is not drawn.

Use these along with x-axis and y-axis renderers if you want axes that intersect the origin or some other point.

parameter
(plot-animating?) → boolean?
(plot-animating? animating?) → void?
animating? : boolean?
= #f

When #t, certain renderers draw simplified plots to speed up drawing. Plot sets it to #t, for example, when a user is clicking and dragging a 3D plot to rotate it.

procedure
(animated-samples samples) → (and/c exact-integer? (>=/c 2))
samples : (and/c exact-integer? (>=/c 2))

Given a number of samples, returns the number of samples to use. This returns samples when plot-animating? is #f.

parameter
(plot-decorations?) → boolean?
(plot-decorations? draw?) → void?
draw? : boolean?
= #t

When #f, axes, axis labels, ticks, tick labels, and the title are not drawn.

8.4 Lines

parameter
(line-samples) → (and/c exact-integer? (>=/c 2))
(line-samples n) → void?
n : (and/c exact-integer? (>=/c 2))
= 500

The number of points to sample when approximating a line. Used as a default keyword argument in function, inverse, parametric, polar, density, function-interval, inverse-interval, parametric-interval, polar-interval, area-histogram and parametric3d.

parameter
(line-color) → plot-color/c
(line-color color) → void?
  color : plot-color/c
= 1
parameter
(line-width) → (>=/c 0)
(line-width width) → void?
  width : (>=/c 0)
= 1
parameter
(line-style) → plot-pen-style/c
(line-style style) → void?
  style : plot-pen-style/c
= 'solid
parameter
(line-alpha) → (real-in 0 1)
(line-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

The pen color, pen width, pen style and opacity of lines in plots. Used as default keyword arguments of function, inverse, lines, parametric, polar, density, isoline, lines3d, parametric3d and isoline3d.

8.5 Intervals

parameter
(interval-color) → plot-color/c
(interval-color color) → void?
  color : plot-color/c
= 3
parameter
(interval-style) → plot-brush-style/c
(interval-style style) → void?
  style : plot-brush-style/c
= 'solid
parameter
(interval-line1-color) → plot-color/c
(interval-line1-color color) → void?
  color : plot-color/c
= 3
parameter
(interval-line1-width) → (>=/c 0)
(interval-line1-width width) → void?
  width : (>=/c 0)
= 1
parameter
(interval-line1-style) → plot-pen-style/c
(interval-line1-style style) → void?
  style : plot-pen-style/c
= 'solid
parameter
(interval-line2-color) → plot-color/c
(interval-line2-color color) → void?
  color : plot-color/c
= 3
parameter
(interval-line2-width) → (>=/c 0)
(interval-line2-width width) → void?
  width : (>=/c 0)
= 1
parameter
(interval-line2-style) → plot-pen-style/c
(interval-line2-style style) → void?
  style : plot-pen-style/c
= 'solid
parameter
(interval-alpha) → (real-in 0 1)
(interval-alpha alpha) → void?
  alpha : (real-in 0 1)
= 3/4

The brush color/style, lower line pen color/width/style, upper line pen color/width/style, and opacity of interval plots. Used as default keyword arguments of function-interval, inverse-interval, lines-interval, parametric-interval and polar-interval.

8.6 Points and Point Labels

parameter
(point-sym) → point-sym/c
(point-sym sym) → void?
  sym : point-sym/c
= 'circle
parameter
(point-size) → (>=/c 0)
(point-size size) → void?
  size : (>=/c 0)
= 6
parameter
(point-alpha) → (real-in 0 1)
(point-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

The symbol, and its size and opacity, used in point plots. Used as default keyword arguments of points and points3d.

parameter
(point-color) → plot-color/c
(point-color color) → void?
color : plot-color/c
= 0
parameter
(point-line-width) → (>=/c 0)
(point-line-width width) → void?
width : (>=/c 0)
= 1

The color and line width of symbols used in point plots and labeled points. Used as default keyword arguments of points and points3d, as well as in point-label, function-label, inverse-label, parametric-label, polar-label and point-label3d.

parameter
(label-anchor) → anchor/c
(label-anchor anchor) → void?
  anchor : anchor/c
= 'left
parameter
(label-angle) → real?
(label-angle angle) → void?
  angle : real?
= 0
parameter
(label-alpha) → (real-in 0 1)
(label-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1
parameter
(label-point-size) → (>=/c 0)
(label-point-size size) → void?
  size : (>=/c 0)
= 4

Point label anchor, angle, and opacity, and the size of points next to labels. Used as default keyword arguments of point-label, function-label, inverse-label, parametric-label, polar-label and point-label3d.

8.7 Vector Fields

parameter
(vector-field-samples) → exact-positive-integer?
(vector-field-samples n) → void?
n : exact-positive-integer?
= 20
parameter
(vector-field3d-samples) → exact-positive-integer?
(vector-field3d-samples n) → void?
n : exact-positive-integer?
= 9

The default number of samples vector-field and vector-field3d take, respectively.

parameter
(vector-field-color) → plot-color/c
(vector-field-color color) → void?
  color : plot-color/c
= 1
parameter
(vector-field-line-width) → (>=/c 0)
(vector-field-line-width width) → void?
  width : (>=/c 0)
= 2/3
parameter
(vector-field-line-style) → plot-pen-style/c
(vector-field-line-style style) → void?
  style : plot-pen-style/c
= 'solid
parameter
(vector-field-scale)
→ (or/c real? (one-of/c 'auto 'normalized))
(vector-field-scale scale) → void?
  scale : (or/c real? (one-of/c 'auto 'normalized))
= 'auto
parameter
(vector-field-alpha) → (real-in 0 1)
(vector-field-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

The default pen color, pen width, pen style, scaling factor, and opacity used by vector-field and vector-field3d.

8.8 Error Bars

parameter
(error-bar-width) → (>=/c 0)
(error-bar-width width) → void?
  width : (>=/c 0)
= 6
parameter
(error-bar-color) → plot-color/c
(error-bar-color color) → void?
  color : plot-color/c
= 0
parameter
(error-bar-line-width) → (>=/c 0)
(error-bar-line-width pen-width) → void?
  pen-width : (>=/c 0)
= 1
parameter
(error-bar-line-style) → plot-pen-style/c
(error-bar-line-style pen-style) → void?
  pen-style : plot-pen-style/c
= 'solid
parameter
(error-bar-alpha) → (real-in 0 1)
(error-bar-alpha alpha) → void?
  alpha : (real-in 0 1)
= 2/3

The default width, pen color/width/style, and opacity used by error-bars.

8.9 Contours and Contour Intervals

procedure
(default-contour-colors zs) → (listof plot-color/c)
  zs : (listof real?)
=
(color-seq* (list (->pen-color 5) (->pen-color 0) (->pen-color 1))
            (length zs))
procedure
(default-contour-fill-colors z-ivls) → (listof plot-color/c)
  z-ivls : (listof ivl?)
=
(color-seq* (list (->brush-color 5) (->brush-color 0) (->brush-color 1))
            (length z-ivls))

The default values of the parameters contour-colors and contour-interval-colors, respectively.

parameter
(contour-samples) → (and/c exact-integer? (>=/c 2))
(contour-samples n) → void?
n : (and/c exact-integer? (>=/c 2))
= 51

The number of samples taken in 2D contour plots. Used as a defaut keyword argument in isoline, contours and contour-intervals.

parameter
(contour-levels)
→ (or/c 'auto exact-positive-integer? (listof real?))
(contour-levels levels) → void?
  levels : (or/c 'auto exact-positive-integer? (listof real?))
= 'auto
parameter
(contour-colors) → (plot-colors/c (listof real?))
(contour-colors colors) → void?
  colors : (plot-colors/c (listof real?))
= default-contour-colors
parameter
(contour-widths) → (pen-widths/c (listof real?))
(contour-widths widths) → void?
  widths : (pen-widths/c (listof real?))
= '(1)
parameter
(contour-styles) → (plot-pen-styles/c (listof real?))
(contour-styles styles) → void?
  styles : (plot-pen-styles/c (listof real?))
= '(solid long-dash)

The number, pen colors, pen widths, and pen styles of lines in contour plots. Used as default keyword arguments of contours, contour-intervals, contours3d, and contour-intervals3d.

parameter
(contour-alphas) → (alphas/c (listof real?))
(contour-alphas alphas) → void?
alphas : (alphas/c (listof real?))
= '(1)

The opacities of lines in contour plots. Used as a default keyword argument in contours and contours3d.

parameter
(contour-interval-colors) → (plot-colors/c (listof ivl?))
(contour-interval-colors colors) → void?
  colors : (plot-colors/c (listof ivl?))
= default-contour-fill-colors
parameter
(contour-interval-styles)
→ (plot-brush-styles/c (listof ivl?))
(contour-interval-styles styles) → void?
  styles : (plot-brush-styles/c (listof ivl?))
= '(solid)
parameter
(contour-interval-alphas) → (alphas/c (listof ivl?))
(contour-interval-alphas alphas) → void?
  alphas : (alphas/c (listof ivl?))
= '(1)

The brush colors, brush styles, and opacities of intervals in contour plots. Used as default keyword arguments of contour-intervals and contour-intervals3d.

8.10 Contour Surfaces

parameter
(contour-interval-line-colors) → (plot-colors/c (listof ivl?))
(contour-interval-line-colors colors) → void?
  colors : (plot-colors/c (listof ivl?))
= '(0)
parameter
(contour-interval-line-widths) → (pen-widths/c (listof ivl?))
(contour-interval-line-widths widths) → void?
  widths : (pen-widths/c (listof ivl?))
= '(1/3)
parameter
(contour-interval-line-styles)
→ (plot-pen-styles/c (listof ivl?))
(contour-interval-line-styles styles) → void?
  styles : (plot-pen-styles/c (listof ivl?))
= '(solid)

The pen colors, widths, and styles of the sampling grid, where it intersects contour intervals. Used as default keyword arguments of contour-intervals3d.

8.11 Rectangles

parameter
(rectangle-color) → plot-color/c
(rectangle-color color) → void?
  color : plot-color/c
= 3
parameter
(rectangle-style) → plot-brush-style/c
(rectangle-style style) → void?
  style : plot-brush-style/c
= 'solid
parameter
(rectangle-line-color) → plot-color/c
(rectangle-line-color pen-color) → void?
  pen-color : plot-color/c
= 3
parameter
(rectangle-line-width) → (>=/c 0)
(rectangle-line-width pen-width) → void?
  pen-width : (>=/c 0)
= 1
parameter
(rectangle3d-line-width) → (>=/c 0)
(rectangle3d-line-width pen-width) → void?
  pen-width : (>=/c 0)
= 1/3
parameter
(rectangle-line-style) → plot-pen-style/c
(rectangle-line-style pen-style) → void?
  pen-style : plot-pen-style/c
= 'solid
parameter
(rectangle-alpha) → (real-in 0 1)
(rectangle-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

The brush color/style of faces, pen color/width/style of edges, and opacity of recangles. Used as default keyword arguments of rectangles, area-histogram, discrete-histogram, rectangles3d and discrete-histogram3d.

The default pen width of 3D rectangle edges is narrower for aesthetic reasons.

parameter
(discrete-histogram-gap) → (real-in 0 1)
(discrete-histogram-gap gap) → void?
gap : (real-in 0 1)
= 1/8

The gap between histogram bars, as a percentage of bar width. Used as a default keyword argument of discrete-histogram, stacked-histogram, discrete-histogram3d and stacked-histogram3d.

parameter
(discrete-histogram-skip) → (>=/c 0)
(discrete-histogram-skip skip) → void?
skip : (>=/c 0)
= 1
parameter
(discrete-histogram-invert?) → boolean?
(discrete-histogram-invert? invert?) → void?
invert? : boolean?
= #f

Distance on the x axis between histogram bars, and whether to draw histograms horizontally. Used as default keyword arguments of discrete-histogram and stacked-histogram.

parameter
(stacked-histogram-colors) → (plot-colors/c nat/c)
(stacked-histogram-colors colors) → void?
  colors : (plot-colors/c nat/c)
= (λ (n) (build-list n add1))
parameter
(stacked-histogram-styles) → (plot-brush-styles/c nat/c)
(stacked-histogram-styles styles) → void?
  styles : (plot-brush-styles/c nat/c)
= '(solid)
parameter
(stacked-histogram-line-colors) → (plot-colors/c nat/c)
(stacked-histogram-line-colors pen-colors) → void?
  pen-colors : (plot-colors/c nat/c)
= (stacked-histogram-colors)
parameter
(stacked-histogram-line-widths) → (pen-widths/c nat/c)
(stacked-histogram-line-widths pen-widths) → void?
  pen-widths : (pen-widths/c nat/c)
= '(1)
parameter
(stacked-histogram-line-styles) → (plot-pen-styles/c nat/c)
(stacked-histogram-line-styles pen-styles) → void?
  pen-styles : (plot-pen-styles/c nat/c)
= '(solid)
parameter
(stacked-histogram-alphas) → (alphas/c nat/c)
(stacked-histogram-alphas alphas) → void?
  alphas : (alphas/c nat/c)
= '(1)

Stacked histogram brush colors/styles, pen colors/widths/styles, and opacities. Used as default keyword arguments of stacked-histogram and stacked-histogram3d.

8.12 Non-Border Axes

parameter
(x-axis-ticks?) → boolean?
(x-axis-ticks? ticks?) → void?
  ticks? : boolean?
= #t
parameter
(y-axis-ticks?) → boolean?
(y-axis-ticks? ticks?) → void?
  ticks? : boolean?
= #t
parameter
(x-axis-labels?) → boolean?
(x-axis-labels? labels?) → void?
  labels? : boolean?
= #f
parameter
(y-axis-labels?) → boolean?
(y-axis-labels? labels?) → void?
  labels? : boolean?
= #f
parameter
(x-axis-far?) → boolean?
(x-axis-far? far?) → void?
  far? : boolean?
= #f
parameter
(y-axis-far?) → boolean?
(y-axis-far? far?) → void?
  far? : boolean?
= #f
parameter
(x-axis-alpha) → (real-in 0 1)
(x-axis-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1
parameter
(y-axis-alpha) → (real-in 0 1)
(y-axis-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

Default values for keyword arguments of x-axis, y-axis and axes.

parameter
(polar-axes-number) → exact-nonnegative-integer?
(polar-axes-number n) → void?
  n : exact-nonnegative-integer?
= 12
parameter
(polar-axes-ticks?) → boolean?
(polar-axes-ticks? ticks?) → void?
  ticks? : boolean?
= #t
parameter
(polar-axes-labels?) → boolean?
(polar-axes-labels? labels?) → void?
  labels? : boolean?
= #t
parameter
(polar-axes-alpha) → (real-in 0 1)
(polar-axes-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1/2

Number of polar axes, whether radius ticks (i.e. lines) are drawn, whether labels are drawn, and opacity. Used as default keyword arguments of polar-axes.

8.13 Surfaces

parameter
(surface-color) → plot-color/c
(surface-color color) → void?
  color : plot-color/c
= 0
parameter
(surface-style) → plot-brush-style/c
(surface-style style) → void?
  style : plot-brush-style/c
= 'solid
parameter
(surface-line-color) → plot-color/c
(surface-line-color pen-color) → void?
  pen-color : plot-color/c
= 0
parameter
(surface-line-width) → (>=/c 0)
(surface-line-width pen-width) → void?
  pen-width : (>=/c 0)
= 1/3
parameter
(surface-line-style) → plot-pen-style/c
(surface-line-style pen-style) → void?
  pen-style : plot-pen-style/c
= 'solid
parameter
(surface-alpha) → (real-in 0 1)
(surface-alpha alpha) → void?
  alpha : (real-in 0 1)
= 1

Surface brush color/style, pen color/width/style of the sampling grid where it intersects the surface, and opacity. Used as default keyword arguments of surface3d, polar3d and isosurface3d.

procedure
(default-isosurface-colors zs) → (listof plot-color/c)
  zs : (listof real?)
=
(color-seq* (list (->brush-color 5) (->brush-color 0) (->brush-color 1))
            (length zs))
procedure
(default-isosurface-line-colors zs) → (listof plot-color/c)
  zs : (listof real?)
=
(color-seq* (list (->pen-color 5) (->pen-color 0) (->pen-color 1))
            (length zs))

The default values of the parameters isosurface-colors and isosurface-line-colors, respectively.

parameter
(isosurface-levels)
→ (or/c 'auto exact-positive-integer? (listof real?))
(isosurface-levels levels) → void?
  levels : (or/c 'auto exact-positive-integer? (listof real?))
= 'auto
parameter
(isosurface-colors) → (plot-colors/c (listof real?))
(isosurface-colors colors) → void?
  colors : (plot-colors/c (listof real?))
= default-isosurface-colors
parameter
(isosurface-styles) → (plot-brush-styles/c (listof real?))
(isosurface-styles styles) → void?
  styles : (plot-brush-styles/c (listof real?))
= '(solid)
parameter
(isosurface-line-colors) → (plot-colors/c (listof real?))
(isosurface-line-colors pen-colors) → void?
  pen-colors : (plot-colors/c (listof real?))
= default-isosurface-line-colors
parameter
(isosurface-line-widths) → (pen-widths/c (listof real?))
(isosurface-line-widths pen-widths) → void?
  pen-widths : (pen-widths/c (listof real?))
= '(1/3)
parameter
(isosurface-line-styles) → (plot-pen-styles/c (listof real?))
(isosurface-line-styles pen-styles) → void?
  pen-styles : (plot-pen-styles/c (listof real?))
= '(solid)
parameter
(isosurface-alphas) → (alphas/c (listof real?))
(isosurface-alphas alphas) → void?
  alphas : (alphas/c (listof real?))
= '(1/2)

The number, brush colors/styles, pen colors/widths/styles, grid color/widths/styles, and opacities of nested isosurfaces. Used as default keyword arguments of isosurfaces3d.

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1	Introduction
2	2D and 3D Plotting Procedures
3	2D Renderers
4	3D Renderers
5	Nonrenderers
6	Axis Transforms and Ticks
7	Plot Utilities
8	Plot and Renderer Parameters
9	Plot Contracts
10	Porting From Plot <= 5.1.3
11	Legacy Typed Interface
12	Compatibility Module

8.1	Compatibility
8.2	Output
8.3	General Appearance
8.4	Lines
8.5	Intervals
8.6	Points and Point Labels
8.7	Vector Fields
8.8	Error Bars
8.9	Contours and Contour Intervals
8.10	Contour Surfaces
8.11	Rectangles
8.12	Non-Border Axes
8.13	Surfaces